Valve-core extractor



. J. R. C. SMITH vALvE; coma ExTnAcTon Filed Oct. 30, 1925 l Il 'INVETOR Jac/(Ratsm ATTORNEYS Patented May 31, 1927.,

`iiniriin stares y restait serios. l

JACK R. C. SMITH, OFVICTSRA, BRTISH CGLUMBIA, CANADA.

vVALVEGORE EXTRACTOR.

Application filed OctobrBO, 1925.V Serial No. 65,830.

Figure 1 is a side elevation of the valve'.

extractor, the valve core ywhich is intended toV be extracted beingAshown in dotted lines for the purpose of illustration. I f

Figure 2 is a Acentral longitudinal sec tional view of the handle of thevalve extractor. y

Figure 3 is a cross section on the line 3-3 of Figure 2.

Figure 4 is a detail perspective view of the double pawl. Y

Figure 5 is across section on the line 5 5 of Figure 2.

Figure 6 is a detail perspective vview of the pawl spring and mountingplate.

It is commonly known that to remove the valve core, often referred to asthe valve.

insides of va pneumatic tire is notreasily accomplished. The ordinaryvalve cap y1s slotted for the purpose, however, providing an inadequatehold upon the core thereby making the removing operation more laboriousthan itv ought to be.V The valve core sometimes sticks and inasmuch asthe valve cap is frail the slotted end will twist yout oi shape anddefeat the very purpose for which it is intended.

y The Vimproved tool is designed particularly for extracting andreplacing the valve core.

Although the illustrations are vrelatively large, in practice the toolAwill be small enough to conveniently get between the spokes of thewheel so that the operation may be rcarried out without diiiiculty.

It consists principally oi a handle 1, shaft 2, core socket 3, returnspring fiand button 5 by means of which the shaft is made to turn eitherright or left. spring 4 is disposed between a recess 6 in the handlebody 7 and a cup-shapedterminal 8 on the socket 3. The purpose of thespring is to return the handle 1 tolthe upperv extremity of VtheV shaft2 at the end of av stroke, and in order that the handle may be y limitedthe shaft is provided with a suitable,-

stop collar 9. v e

`A bore 10 in the body 7 houses the right and leiit hand nuts 11 and 12through "which the shai't passes. The nuts include` toothed Y rims 13and leiwitli which the blades 15 and- 16 of the double pawl 17 arerespectively engageable. The double pawl occupies alateral opening 18extending` from the bore 10.

A barrel 19lits around and is carried by the body, concealing` andholding the double pawi .in place. screw 20.

.Piiitles 21v at the extremities of the double rlhe barrel is retainedby a,-

pawl have bearing in recesses22 inthe body 7. It isj anticipated thatthedouble pawl canrbe made to serve the sainey purpose as followsbyappropriately twisting it out of' Recesses123 in theV a single piece ofsteel.

sides of the double pawl receive the ends of' a curved leaf spring 24the purpose of which is to hold the blades 15k and 16 in contact withthe toothed rims of the respective nuts.

let

The lspring'is,attached to the mounting plate 25 (Figggs.l 5 and 6)which rides over .and covers the slot 26 in the barrel in whichslot theshank 27 Voi thebuttonv is movable. vThe ,l

shank l27 is attached to the mounting plate'` which thus carries' thebutton.

Shifting oi" f the button toward the extremities of the slot l v26 willkso change the tension of the ends of the spring that the double pawl 17is made to rock upon itspintles 21 iii one orv Y the other direction soas 'to engage and lock'.

ties of the slots to liold'the button 5 in its I adjusted positions.

Studs 3() and 81 on the interior of thenuts 11 and 12 engage in thespiral grooves 32 and 33 in the shatt2. lnFigure 2- the stud 30 issituated on the far side otlieshaiit2- but the stud 31 is supposed to beon the near f f side. The studs are held in place in the handle bodybymeans oi a lock collarB-/iwhich l has spanner wrench holes 35 whichpermit application and removal thereon.. vThe spring 321i, mentioned fbefore, occupies a curvedslot 36 4(Figs. 2 and 5) in the body 7,

' turn of thershaft. shifted over` 'so `that the shank 27 occupies `theright end of the slot 26 in Figure 5, the

- is then transferred to the opposite extremity .This fin is now engagedby the socket 3 when the tool is inserted .in the end of thev tirevalve. The direction. of turning of the shaft 2 is determined by theposition of the button 5. The particular position adopted in Figures 2,3 and'5`Will produce a rightl hand The button 5 has been direction ofshifting the button agreeing With the vdirection of turning of the shaftWhich said shifting accomplishes'. Y The resulting buckling of thecurved spring 24 puts it under tension but the double paivl 17 is rockedupon its pintles 21 sol that the blade 15 engages the toothed rim 13ofthe right hand nut 11. The pres sure is. applied to the double pawlbelow its pivotal mounting, and the aforesaid rocking of the double paWlresults. The blade 15 therefore locks the nut 11fto the handle 1. Theoperator now grasps the handle 1 and pushes dovvn. It is assumed thatthe socket V8 has been set in place upon the valve 4.

The stud 30, being locked, -t'o the handle VWill move in a rectilinearline, causing such displacement, so to speak of the spiral groove 32that the shaft 2 Will turn in the clockwiseV direction, looking downupon the tool. Upon the return stroke of the handle 1 the toothed rim 13Will simply ride over the blade 15 ofthe double payvl with a ratchetmotion in the event that thev sprocket 3 is held in position Where thelast turning ef. fort of the shaft left it. necessary that the socket 3Vbe swivelly carried by the shaft. The foregoing operation Will serve todrive the core C into place in the valve stem. Upon shiftingthe button 5to the opposite extremity of the .slot 26 the reverse action will takeplace.v The tension of the slot 26; the reverse action will take Thetens-ion is thenl transferred to double pavvl 17 rocks until, the blade16 engages and holds the toothed rim 14 of the Vnut 12. This nut 12 isthen locked upon the handle 1, and apush upon the handle causes the stud31 (Fig. 2)v to move in the rectilin- -ear directioucamsing suchdisplacement'of the groove 33 as Will turn the shaft 2- in thecounterolockivise direction, looking down upon the tool. This motionWill extract the `core C from the automobile tire air valve.

While the construction and arrangementl of the improved valve corelextractoris that l of aY generally preferred `form, obviously To thisend Vit is modifications and changes may be made Without departing fromthe spirit of the invention or the scope of the claims.

I claim: i

1. A tool comprising a shaft having a pair of spiral grooves running inoppositedirections, a handle reciprocable upon the shaft and having rabore with a lateral opening, a pair o-f nuts occupying the bore and hav-.ing studs engaging the respective grooves,

a double pa'ivl occupying the lateral opening and being pivotallymounted upon the handle, abutton which is shiftable to produce f thedirection of vturning of the shaft `dei sired, resilient means including.a curved spring engaging' the sides of the pawl soA that shifting ofthebutton and the resulting ac.- tion of the spring rocks ythe pawluponyits pivots and locks one or'the other nuts uponY the handle, theother nut remaining loose l and idle, a socket swivelly carried by the ishaft to engage a tire valve core, and a spring interposed between thesocket and the handle to resistthe movement of the handle along theshaft in one direction When said shaft is turned by virtue of theoperation of said locked nut.

tool comprising a shaft having a pair I of spiral groovesrunning inopposite direcy tions, a handle carrying a shiftable button, a pair ofnuts carried by the `handle and` having studs engaging the respectivegrooves and having toothed rims, a double paWl pivotally mounted in thehandle and having a recess at each side, a curvedv Aspring carried bythe buttonv having its extremities `engaging the respective recesses sothat shift-l curvedslot communicating at itsends With said lateralopening, a pair of nuts situated in the bore eachfhaving a stud engaginga.. respective groove and having a toothed portion, a shiftable button,a double pawl occupying said lateral opening and having pintlesjournaledupon the handle body, a l

barrel engaging the body to conceal lthe double paivli and having a`slot thereon, af

shank carrying the buttonextending through and being carried by theslot, and'aI curved spring carried by the button and having the oppositeend extending around the' curved `slot into engagement With'the sides ofthe paivl to accomplish rocking of the paw] upon itsipintlesas thebutton-'is slid in the slot whereby to lock one or the other vofthekfnutsff upon the handle for turning of the shaft in a givendirection.

4. A tool Comprising ay shaft having spiral grooves running in oppositedirections, a handle body reciprocable upon the shaft and including abarrel, there being a slot in the barrel with recesses adjacent to theeX- treinities of the slot; a pair of nuts carried by the handle andhaving studs engaging the respective grooves, a double paWl carried bythe handle and having recesses at the sides, a curved spring carried byand actuated by the button to rock the double paWl and lock one or theother of the nuts upon the handle, the extremities of the springengaging said paWl recesses, and amounting plate carrying the button toWhich mount` ingplate the spring is applied, said plate JACK n. o.SMITH.

